Machine for applying pressure to shoe bottoms



Dec. 21, 19.43. s. :1. FINN 2,337,093

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Original Filed Dec. 13, 1941 I 2 Sheets-Sheet 1 Flg". l

- 40 15 Q O 158 150 Q/ 42 36 a x H6 144 z 4 8 0 146' 44, r 82 a if 44 14 Dec. 21, 1943.

s. J. FINN [2,337,093

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Original FilecLDecQ 13; 1941 Fig. 3

U r 78 62 5a 2 g Fig.4

2 Sheets-Sheet 2 Patented Dec. 21, 1943 MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Sidney J. Finn, Beverly, Mass, assignor to United Shoe Machinery Corporation,

Flemington,

N. 3., a corporation of New Jersey Original application December 13, 1941, Serial No.

422,868. Divided and this application December 26, 1342, Serial No. 470,188

11 Claims.

This invention relates to machines for applying pressure to shoe bottoms and particularly to machines for practising the method disclosed in my application for Letters Patent of the United States, Serial No. 422,808, filed December 13, 1941, of which this application is a division.

In the practise of the method of the application just referred to, the attaching faces of a shoe and sole are provided with cement which will adhere when the parts are brought in contact sufficiently. at least, to prevent the parts from slipping relatively to each other. The forepart of the sole is located, for example, by hand upon the forepart of the shoe. The shank portion of the sole is then bent away from the shank portion of the shoe a predetermined amount and the heel end of the sole brought in contact with the heel-seat of the shoe and caused to adhere.

The shoe so prepared is then placed in the machine of the present invention which comprises a resilient padto receive the sole of a shoe, the shank portion of the pad being normally bent away from the shoe sufficiently to accommodate the outwardly bulging shank portion of the shoe. The machine is provided with abutments for engaging the forepart of the shoe and the heel end of the last which are operated to apply predetermined pressure to the shoe, thus firmly seating the forepart and heel-seat of the sole against the shoe to cause adhesion. After this pressure has been applied, means is provided to force the shank portion of the pad up against the shank portion of the shoe and then, by means of an inflatable bag covering the entire shoe bottom, the pad is forced with uniform pressure against the entire shoe bottom, thus insuring permanent cement attachment of the shank portion as well as the remainder of the sole in close-fitting relation to the upper of the shoe.

The illustrated apparatus comprises a pad box having a forepart and a heel part relatively adjustable to accommodate lasts of varying spring and a shank portion constructed and arranged to move perpendicularly to a plane joining the adjacent edges of the forepart portion and heel portion to close the space between them. In the pad box are a solid pad and an inflatable pad, both so molded as normally to project into the Space between the forepart portion and the heel portion when the shank portion is withdrawn. The shank portion is supported by toggles straightening of which moves the shank portion into operative position in a direction perpendicular to a plane joining the adjacent edges of the forepart portion and the heel portion of the blocks, and fluid pressure means is provided for straightening the toggles. Preferably and as shown, the inflating of the pad is controlled by operation of the toggles so that the pad cannot be fully inflated until the toggles have reached their fully straightened position to support the shank portion of the box.

In the drawings,

Fig. l is an elevation, partly insection, of the operating instrumentalities of a cement sole attaching machine equipped with the present invention;

Fig. 2 is a detail view similar to Fig. 1 showing the parts in operative position;

Fig. 3 is a sectional view on the line'IlI-III of Fig. 2; and

Fig. 4 illustrates diagrammatically a cement sole attaching machine equipped'with the present invention.

The general organization of the machine may, in most respects, be similar to that disclosed in United States Letters Patent No. 2,301,285, granted November 10, 1942, in my name, which is shown diagrammatically in Fig. 4. The machine is provided with the novel pad box construction shown in Figs. 1. 2 and 3.

The pad box has a forepart portion iii secured to a frame l2 and an adjustable heel portion [4 which rests on a block it ivoted to a lever IS. The lever is iJ-shaped, its ends being fulcrumed at 20 on the frame i2 and its forward end, which forms the loop of the U, rests on a slide 22 which is mounted in a bracket 2% secured to the frame l2. The slide 22 is arranged for upward and outward movement and is held against downward movement by a pawl '26 engaging teeth 28 in the front side of the slide. The pawl 28 is held in engagement with the teeth 28 by a spring 36 which hasa fingerpiece 32 by which it may be released so that the operator, by grasping a handle 3 may move the slide and the forward end of the lever up and down. The end of the heel portion it of the pad next to the shank is connected at each side to a branch of the U-shaped lever ill by a link 36, as is best shown in Fig. 37 Movement of the slide 22. therefore, will adjust the part it of the pad b'ox'relatively to its forepart to adapt the pad for shoes that are designed to receive heels of diilerent heights, that is, for the spring of the last.

Between the rear part [4 and the forepart ID of the pad box is a shank portion or plate 38 which is arranged to'move vertically into and out of position to fill the space between them. In the pad box'is a solid rubber pad 40, and an inflatable pad 42 is arranged beneath the pad 40 and connected with a pipe 44 through which fluid under pressure may be supplied to inflate the pad. The shank portions of both pads 40, 42 are preferably so formed that they normally project downwardly between the heel part and the forepart of the pad toward the shank plate 38. Extending downwardly at each side of the pad box is a plate 46. The upper corners of each plate are pivoted respectively to the heel part I4 at 48 and to the forepart II] at 50 (Fig. 2), the plates thus forming links between the forepart I and the heel part I4. The plates 46 extend down between the branches of the U- shaped lever I8 (Fig. 3) and are spaced apart sufficiently to permit movement of the shank plate 38 between them. Projecting from each side of the shank plate 38 is a pin 52 guided in a slot 54 provided in one of the plates 46, the

slots being perpendicular to a plane joining the pivots 48, 50. On the under side of the end of the plate 38 next to the forepart pin are bifurcated ears 56 to which the upper ends of toggle links 58 are pivoted by pins 60. The lower ends of the links 58 are each pivoted by a rod 62 to bifurcated ears 64 formed on a member 66 which constitutes the lower links of a double toggle of which 58, 58 are the upper links. The member 66 has at each side an ear 68 which is pivoted by a pin 10 to one of the plates 46. Rearwardly of the double toggle 58, 66 is another pair of similar toggles the upper links 12 of which are pivoted at 14 (Fig. 2) to the shank plate 38 and the lower links 16 of which are pivoted at 18, one to each of the plates 46. The joint of the double toggle 12, 16 is formed by a rod 80 which passes through the adjacent ends of both pairs of links 12, 16 and is connected by a tension spring 82 to the block I 6. The spring tends to break the toggle in a forward direction. The rod 80 forming the joint of the forward toggles is connected by links 84 to the rod 62 which forms the joint of the rearward toggles 58, 66. The links 84 cause the forward and rearward toggles to act in unison and when straightened to effect upward movement of the shank plate into the gap between the adjacent ends of the forepart I0 and the heel part I4 of the pad box.

Since the upper corners of each plate 46 are pivoted one at 48 to the heel part I4 and the other at 50 to the forepart I0, these plates partake of the heightwise adjustments of the heel part I4 to accommodate lasts of difierent spring, and the plate 38, since it is carried by the plates 46 and is guided by the pins 52 in the slots 54 which extend perpendicular to a line joining the pivots 48, 58, will always be moved by operation of the toggles in a direction perpendicular to the shank portion of the pad, that is, perpendicular to a line joining the pivots 48, 50.

In the middle of the member 66 (Fig. 3) is a pair of ears 16 between which is a rack bar 18 and through which and the rack bar the rod 62 passes, the rack bar being moved longitudinally when the toggles are operated. Teeth 90 on the rack bar (Figs. 1 and 2) engage a pinion 92 secured to the stem of a rotary valve 84 in the pipe 44, the arrangement being such that when the toggles are nearly straight the valve will be opened. A guide 95 for the rack 88 is pivoted on the valve stem and serves to hold the rack in engagement with the pinion 92. The member 66 has a lateral extension 86 carrying a roll 98 upward pressure on which will straighten the toggles and raise the plate 38, as above explained.

Beneath the roll 98 is a flat plate I00 extending lengthwise of the pad box and narrow enough to pass between the lower pivots of the toggles to engage the roll 98. The plate I00 is carried by a fluid-operated plunger I02 (Fig. 1) mounted in a cylindrical recess I04 in the bracket 24 and held from turning by a pin I06 on the plate I00, the pin sliding in a. vertical hole in the bracket. The lower end of the cylinder I04 communicates with a pipe I08 through which fluid under pressure may be supplied to operate the plunger.

Referring now to Fig. 4, the shoe with its sole located at the forepart and heel and with its shank portion bent away from the shoe a predetermined amount, as may be done for example by apparatus disclosed in my application for Letters Patent of the United States, Serial No. 470,- 189, filed December 26, 1942, is placed upon the pad 40 with the shank portion of its sole occupying the depression in the shank portion of the pad. In the base of the machine is an oil reservoir IIO through which a rotary pump II2 supplies oil to a pipe II4 leading to a slide valve I I6 at a pressure determined by a pressure control valve I I8. Overflow from this valve is led to another pressure control valve I20 which supplies oil at a lower pressure to a pipe I22 leading to a slide valve I24. The slide valve H6 is connected by a link I26 to a treadle I28 pivoted at I30. When the treadle is depressed to lift the valve I I6, oil is admitted under high pressure to a cylinder I32, causing a plunger I34 in the cylinder to push up on a rod I36 which is pivoted to the mid portion of a lever I38 fulcrumed at I40 to a cam I42 having a fixed pivot at I44. A pin I46 on the end of the lever opposite its fulcrum is connected by a tension spring I48 to a fixed pin I50. Upward movement of the rod I36 acts at first to turn the cam I42 which, acting on a block I52, turns a lever I54 pivoted at I 56 counterclockwise to cause abutments I58, I60 carried thereby to engage respectively the last and forepart of the shoe and to press the shoe down upon the pad, thus applying pressure to the forepart and heel part of the shoe but not to the shank portion which is at this time unsupported, the shank portion of the sole lying in the depression of the shank portion of the pad 40. When a pressure determined by the tension of the spring I48 has been applied to the shoe, the spring yields, allowing lever I38 to turn on its fulcrum I40 and lift a link I62 which is pivoted at its lower end to an intermediate portion of a lever I 64 fulcrumed at I66. The opposite end of the lever I64 is connected to the valve I24 which is lifted by the lever to open the valve, thus admitting oil from the pipe I22 at reduced pressure to the pipe I08 connected to the cylinder I04. The pipe I08 has a branch I68 leading to a cylinder I10 in which is a double piston I12, the lower end of the cylinder receiving oil under pressure from the pipe I68 and the upper portion of the cylinder is filled with water, including the pipe 44 which leads to the inflatable pad 42.

When the slide valve I24 is opened as described, pressure will be delivered to the pipe I08 to cause the plunger I02 to rise and engage the roll 98, causing the toggles to straighten and the shank plate 38 to move into the gap between the forepart I0 and the heel part I4 of the pad box. Just before the toggles 58, 66 reach their straightened position, the valve 92 in the pipe 44 will be opened by the action of the rack bar 88 on the pinion 92, thus permitting pressure in-the pipe I68 to act on the piston I12 to force the water through the pipe 44 into the inflatable pad 42 whereby uniform pressure is applied to the entire shoe bottom. The toggles supporting the shank plate 38 become fully straightened before any substantial pressure is built up in the inflatable pad and serve to support the shank plate rigidly while the shoe is under pressure. To bridge any gap which may occur between the shank plate 38 and the heel part I4 of the pad box, a thin plate I14 (Fig, 2) is pivoted at I16 to the heel part M of the box and at its opposite edge overlies the adjacent edge of the shank plate 38.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a cement sole attaching machine, a pad box comprising a forepart portion and a heel part relatively adjustable in accordance with the spring of the last, a shank portion movable normal to a plane joining the adjacent ends of the forepart and heel part, and means for supporting said shank portion for movement into and out of position to close the space between the forepart portion and the heel part.

2. In a cement sole attaching machine, a pad box comprising a forepart portion and a heel portion relatively adjustable in accordance with the spring of the last, a shank portion movable into and out of position to close the space between the iorepart portion and the heel portion, and a pad normally shaped to bulge into the space between the forepart portion and the heel portion when the shank portion is withdrawn.

3. In a cement sole attaching machine, a pad box comprising a forepart, a heel part and a shank part, said shank part being initially depressed a substantial distance away from the gap between the forepart and heel part, a pad in the box having its shank portion depressed away from the shank of a shoe placed thereon, and means for operating the shank part to move it into position to close the gap between the iorepart and heel part.

a. In a cement sole attaching machine, the combination of a pad box comprising a forepart portion and a heel portion relatively adjustable in accordance with the spring of the last, a shank portion movable heightwise of the box into and out of the space between the forepart portion and the heel portion, an inflatable pad in. said box having a shank portion arranged to extend into the space between the iorepart portion and the heel portion when the shank portion is displaced away from the shoe, means for applying pressure to a shoe on said pad, means for operating the shank portion of the box to force the shank portion of the pad against the sole, and means for inflating the pad.

5. In a cement sole attaching machine, the combination of a pad box having a forepart portion and a heel part relatively adjustable to accommodate lasts of different spring, a shank portion movable into and out of the space between the forepart portion and the heel part, an inflatable pad in said box, means for applying pressure to a shoe on said pad, means for operating the shank portion of the box to force the shank portion of the pad against the shoe, and means for inflating the pad controlled by movement of the shank portion into the space between the forepart portion and the heel part of the box.

6. In a cement sole attaching machine, a pad box comprising a forepart, a heel part and a shank part, said shank part being initially disposed a substantial distance away from the gap between the forepart and heel part, a pad in the box having its shank portion disposed away from the shank of a shoe pl'aced thereon, and fluid-operated means for moving the shank part into position to close the gap between the forepart and the heel part.

7. In a cement sole attaching machine, the combination of a pad box comprising a forepart and a heel part relatively adjustable to accommodate lasts of different spring, a shank portion movable normal to a plane joining the adjacent ends of the forepart and heel part into and out of the space between the forepart and heel part, an inflatable pad in said box having a portion arranged to extend into the space between the forepart and the heel part when the shank portion is disposed away from the shoe, means for applying pressure to a shoe on said pad, means for operating the shank portion of the box to force the shank portion of the pad toward the sole, and means for inflating the pad.

8. In a cement sole attaching machine, a pad box comprising a forepart and a heel part relatively adjustable to accommodate lasts of different spring, a shank portion movable perpendicularly to a plane joining adjacent ends of the forepart and heel part, an inflatable pad in said box, means for supporting said shank portion for movement into and out of position to close the space between the iorepart and the heel part, and means controlled by movement of said shank portion for inflating the pad.

9. In a cement sole attaching machine, a pad box comprising a iorepart and a heel part relatively adjustable to accommodate the spring of different lasts, a shank portion movable into and out of position to close the space between the forepart and the heel part irrespective of the relative adjustment of the forepart and the heel part, and a pad normally shaped to bulge into the space between the forepart and the heel part when the shank portion is withdrawn.

10. In a cement sole attaching machine, a pad box comprising a fixed iorepart portion and a heel part adjustable relatively to the forepart portion to accommodate lasts of different spring, and a shank portion movable normal to a plane joining the adjacent ends of the forepart and heel part irrespective of said adjustment.

11. In a cement sole attaching machine, a pad box comprising a forepart and a heel part relatively adjustable to accommodate lasts of difierent spring, a shank portion movable into and out 'of position to close the gap between the forepart and the heel part, an inflatable pad normally shaped to bulge into the space between the forepart and the heel part when the shank portion is withdrawn, a valve for controlling inflation of the pad, and means operable only when the shank portion is in position to close said space for inflating the pad.

SIDNEY J. FINN. 

